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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f03c63651b5b660b6a718a4f5ff8991af8c071f0d142a244c273841677b15e' 
  AND token = '39b2piaexmagVEEXsw4oiECoxMvBIvqO6PiZZTA7x6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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