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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c9881c178b82b19648622eadce0ee78d0a2568c13b63f5897ac00ee3798635' 
  AND token = 'TmQwM1Gv7h6hGfTB3bHowiUYFnhoU/yhwCzWA9XMCmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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