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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc1603232f6516d47ffbf5a3a9c87a7f6a3e3abd6b896e8f888f584320ec823' 
  AND token = 'Q+1rjiKHBS85D25Dz3jFIDK9d74UrfsvHSUKKMDfas8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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