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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ae24df31d3e7ee976ac93efe61188e1b4afab282f55c2576b6a2a110bf118c' 
  AND token = 'Rtqsa/9ELd/L90B1hdEla3v9baRFMQ8FiUU2f8W+s+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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