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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40736b1bf14e12f0827047bd369ac1e15f2d63efb12cae54fa8d394e523fa0ac' 
  AND token = 'Q34RHUVgL4E0LSsQtvr/oFN2X0PuepBK4nw9LofmupI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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