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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6097b578a68c5d612dfc823de299b5b375dd2db7e74ae573bc43c5003e1c514' 
  AND token = '+hc98YpV2xsNhnNdd7jWQ15oYECaeGrWZgM3aYBgFh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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