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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e092eec0d27e63a965ab259bb30054d7c676e456067a7ddb333dfb6552b5cb38' 
  AND token = 'Jf4n7Rb06GrM2cvUZLs9Lfw2HDh0zXFbMD27xLUIRdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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