SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a0ac8c3fb729667588df9baef74eb35195c25fae9f31d1cf904373ecddbef4' 
  AND token = 'CFJVvIl/P014SU2+JzPIkHiuPiXLpKfyaEpNsw7pNFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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