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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815e4b5cc3762a596a567106bd2aa4df1c2ebcc743ba9e79344a564c9603ceb0' 
  AND token = 'HEuL1Dm8vTAd+zv7ckUIQHVPbsakhsUfWQZp84zBpfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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