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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd772e1047a70b487731b5137169b1310b9a9c3287e3654b1bd8a5595d9af5e' 
  AND token = 'htlGfgtnDlaInOF36y0eDmfm7dFcLCclS6+v15FMM/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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