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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6985088438fda5430e1d2576fe5de3172233eeab62bdf8a8673a4fdff893396f' 
  AND token = 'nNkeyxGbWSUkCaGEGPg0B10i4riE/9sdIaekwDjgf94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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