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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78dbe007c7124482943e12f12105d11758a7029e5a50d8c9b49876aefe14eee' 
  AND token = '55AmD/f6PCQK6R1lNlcvc9zqmj7ez0WvuT/vnn/8kL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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