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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ddddc33d63b2a8359b3c34f7fe744a7b1614eeb6b026d388ae25fa14e837e9' 
  AND token = 'n985Thu0jR84DTRy3X2S3SHfM2DJHmCziqV6k+46fbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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