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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdded1ca3669b5b39fc26ebccfbcf58a3384acbe9f2722bc7209cb08a8ac4a2e' 
  AND token = 'ixySqh3stbCn0kw8brrc4Ub+D6gA332fBo2scHhnHiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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