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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f4c90f11fba37818e4bf70f1f477a08b41d440063f041f9d2a2f5f61d927d3' 
  AND token = '6FSTKvzP3kp7jB0Ak6lfTRuoLyjLR8lOchizdEa9rDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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