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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd803f8f2afb22bc365b8fccc29992cadba373a4b132857e1297679d327475d66' 
  AND token = 'mRS7P3FQUri8PdaKoI8OT3LX2sf48E4mmEqCFr6kXCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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