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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34033f9863931547ac068235f282f120ccd56cf3415724582fb7e10ff25ef34' 
  AND token = 'KE6xmSmCl7xqfD8HBXJxFTM71CF204n+veytTfyIqRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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