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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea510e7713df4511d1f3d135bafb79fad1c40a4c3846246db65b1ca0d354c35' 
  AND token = 'wiy95HlwBUYRosgXvYnFxgiZ1RI1IMcedjG5kXp5OYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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