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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab10e26e0c2dcec8469dc569e003d1f09e193ab95a272e504d8ae85ff913c0f' 
  AND token = 'JP09Zt4zctSwiiKc+3yuGQrFYvRJkmT9rLMSfipX1bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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