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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c423677e4feea993c2468e6d4ed855bfab2579753db98c8a89237a05c814d29' 
  AND token = 'VQ1muF2/28nNIT1kX9N+nbrcDvupxfBoeE+8w/q5UbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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