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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe9db23b001a174e019d9e7b3dfca1f028d02232bc90ae5fcae9d615e89d8cb' 
  AND token = '0q+QCsTBymkMmPutrzfY21mf31+MNSzDVqhDYhlFJ5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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