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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90af6024189a51434285987fbfd1953f86b7a2f3160d2c719219e13e289f0713' 
  AND token = '+web7ETPm99UcSL4JwuIrCvFRkgg7ohwZ4FG2QQcve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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