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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea67c5823ba7403d2077b8f713703b3c4f7142201bea77d1172676ce5557b5d1' 
  AND token = 'vwM61+gitCu3gNF/Xu9wM8cS40x/FQIma3LrUXpjsCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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