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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43615d17f7ca92a24bb941b2f94a8e015524c563d05e9a1413c496b0f984856f' 
  AND token = 'HyCcGBI+H4C6LnEMC40vEPWSrINoOfrfepU3tdqJCEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}