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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dac2b4129da3ee7d37b70c8865db371b6295a854bd7b9faaabc7bec30b63656' 
  AND token = 'QK1xcRxja/50EK/qkVCWmO36AOu7VoPip5958y4iLaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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