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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a1f71dfe51decee47b537403b0908771a0593a7f7281c87615f528c31fb398' 
  AND token = 'pO2SToHeG4c93huYbjPkNNOxpz91fKJmZyADfdKkpYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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