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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e341708cfacf7a8e7e343bd26508d9fc11a244e82ee4e60dc1cca3f2123cd5d8' 
  AND token = 'vcWo6q70xlzzptDktSW6wnVCh1yutxf5ADTv/Ymr3es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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