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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5ddb852514320e8cf6724541ead3c685ba8e47abd72250d31ccc421efef4bf' 
  AND token = 'pmxPHuDKzIRT965Qqk6j/74cv/Qteod6abuVf2ldnag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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