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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51e93e359dfdac7bc53894d04a3af21f4d249b7b3b9ac79612bd0f7653812f6' 
  AND token = 'AYLKe5rPM6dIcj3f/F7Y+6mqULI0TS9Y1IA9kGtNo30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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