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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae1423a1c82d4a38836645418dd6b30a0b2068969583e89e05162561e967cdb' 
  AND token = 'hFOQInwvV3YMukJm2Sjunblr8V6Yk+F1eNT4I7U7cG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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