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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361916032bb695e2130f712f1fcc85d52c400686086a0758fdaee2cad676fb2f' 
  AND token = 'UA0KX6ceQ5Gups1MRJPcCABrrRzMgUnRXrBhHWK+Ts0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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