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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb289b715cf99a7c83289163fa2dd75bd331fe1c86e9971dfe928b1d0a1c558' 
  AND token = '1F3hrDy9RdCUtN2XOhoKP5iBK9KZmubJB5Goe1UZpKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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