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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b565d0f2b79a0e124ae1b039fdde39cc9577cc110f8654a7ce51dd653753756a' 
  AND token = 'yyE0oWUy6iaZhBrajgr7b01TpECKbl7ObEcyU2Cj7vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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