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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56b74a1d16ee771ca4375bf1b8f27c946bb49884154a622fac07179a32fceec' 
  AND token = 'Q11IAnbCvljGZa6Pqg1G6UaDc2U2lp85xLColY4FUXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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