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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75615d040fabde678453d38e3dd752a9ac38e14b2e1343f525510c224285095d' 
  AND token = '3OanrcOdMRPawc6B0UzpaS32g1We5C3usc6vk6Ry2ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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