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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797fd3f4837ddb281f21008cc177b2d96d35e9653d918de092e2ee4e73ee78d4' 
  AND token = 'V8eH9hquuIi0fnBRATKc3aQih2lU9a97LurJ52gM/50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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