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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef858eb36a8ea55e7d54ba6da33af97f54a912a892b0efcc25575c24e2bd212a' 
  AND token = 'dDmzvx2d4h+fKCp7exijRAJKi42FXuw48sD50qOaDDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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