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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c11af97616a36b300b3ae1743a8006f0220831c9bc60039c86ec2d9af86d9e' 
  AND token = 'bVs6wWbEgTxPWaCHm9U2pp65oElFhmADiAHbpswQ7c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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