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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bcf290e15a4abb2b57c51badbc610a6b35a3759eaa911c79a652b21fdc7a5d' 
  AND token = 'gpDEfj77J/A2u9FCZPNtg6yA10wpT5/nUbe41teMa+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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