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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28696d29063885456c418067e3cd2a70c703cb6678a6c8741268a2cac9cb91cb' 
  AND token = 'D5BHQEmPWsCoigImrmmj+sqTGbiuiLn7WX4sXGPsWm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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