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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0891311bbb4ab2766f081e67d8441e83612dd6b1a57b884d60cef7d002002d11' 
  AND token = 'QJb0OG5Okm74AbDP6avKdWWb+nHJ0oy+GCgz5sxBU1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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