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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e365a5c8068491d2fe08c88726307a964a1e58ef35176a2c63a09409d7d95cc7' 
  AND token = '6ZvSi+wsLkftxozd2W6xU3YL0eZ3OKYgxu5eNJa5oIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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