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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544972e30ef21b1ecfd55ca881a8a697cf60b46efe579c3879a82e5cb1146108' 
  AND token = 'cDDB2XU0SLMWtsuk/hYFM1SpertiSjvk2iYBuUlkXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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