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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2d57bb683976de314ddf1dd75f8d8fe1ef70b14f37ff5b22e4684e0aed75eb' 
  AND token = '37yQ7IkyXNx2rSmEABGwzIEeimtCrF3QtZMUZh2RZOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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