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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb679bfd7bc42731e93909839f36cbf42189e9123b35b38a79885807128447ba' 
  AND token = 'eTTgVQBqEcFiRumwy44ZXCV4VbuuN8kal0dqOWg99f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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