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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f38c2a433385e9c76d7e4381372cb4ebe3a84b9a3d4ee3a1b9e3e9d0de7a3d3' 
  AND token = 'DKcYHvOAzDYcsoGtk65coxJ+EHM7jJS/UGsi2MtKDYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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