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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0d4683f9b068f004b9c7a86216d63b00905e082f1103943e5eed36a7bdb112' 
  AND token = 'gfsTbc4H9QeMsOl9+qOY2nk0GLfhvjNDqtK4j3EHKr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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