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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e0ebb837538d94d08c24f3e3bf377756cb11c12381eb154af9a3a3bbb8af50' 
  AND token = 'J/6bUzdLO0ee0H4DNcv7kqW1lNMibPmVIVSPSpw+JtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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