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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06437e6093f7760754ddcabe96ac0b4d85119b7d7b5ee8f7864556f562a653b' 
  AND token = 'DJ6421eTnEgaL2mRPizM5OqGWJpghY2I+uNKe3I4ZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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