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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b830d5f14f449008063bad6302edee811c5466fa982740f02c548797984ad9' 
  AND token = '3pCvE+PQMm13UxKqHgZdKUCRaNl4GyGdu7DgpDP1Dt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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