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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3298e4d740589a5acd42b0c32280ee5a9924e6ae9c7b12c16f92789649f22d16' 
  AND token = '/GswMrOkeJplvuo32dht00wz88e59onXLcV3vwI5REU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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