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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dd27dbe375b8acec2cdadd003bb3331e8f1bbd704693bdd109089eace6e2ab' 
  AND token = 'amyZslO+L61gqhB7BMZDaJAPN18W4HqmBt5IugdL6lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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