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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606a3e30837c31f4ea865e923f5f76a5b8620127cf5286e74c3d696e3f5b876b' 
  AND token = '5nzZ8Wij4h5nYk05ch9/DoceNxINumR022xjGewqALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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