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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf16f02c8b2eb8eb03f551d813773e8d79e096cf22bc0a84eb194dda77e7dc9' 
  AND token = '391yBBufsYrDiZXD5hbzILThJ+g4ZtEeQTgTP8jS1sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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