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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2e7d8225a577b9cee3e84d7001c3597175f825c72a6786f7a55392389f9851' 
  AND token = 'zsjMfLCQYM8eeCrCr8oxDJAYFSkucR1fQUk/vrV0Nu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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