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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a093c49c8f2419ad3e64956ba759e2bb1f626b3b3c597f17cf18d7e7ee078b85' 
  AND token = '1AAnGNT4FSdlrmRc7Sc37qVdsvT3IPNuYiTZ/GFWix0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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