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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ce5a90e707b4ae540efe6da8caf62bb4347a8dbd24d6a534dd4f49139a13b7' 
  AND token = 'zQBGGSMnaO976X24pWkLKq8t9QMG045xi7xRRk+BGso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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