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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd47488f5088fb656b8408151ba59284d86c6c4c8e649e2f267ba790f6aefeaf' 
  AND token = 'EuwsV8KT1MTgOp8hx4oWTfC1dpVy9KJap82A3RAqmzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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