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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d574f852e61e52c7076954973b9987d355ee8c1a244b9df87cdaba7b7982cd' 
  AND token = 'gRevv+VsyW1e1mlB4V1Tv+58BNfKoMnusSGxm6ez1KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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