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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae10c3681c2541de4fddc4943f30f35e4fc18cc4d21a6600f116de974244ad17' 
  AND token = 'sfcU81KMeXLFeLpeBgqpDa8ozZ7pkNTM2jvFTyQx97U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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