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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5d0168005c300ebf89fdb7fd082ed79c431758dc386372ab95f8b7e9db594e' 
  AND token = 'LZyqUMNgI4ZaWBKZfP9IQVdddjyjE5RHO+N0b22VSHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00198

JSON explain

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