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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6e57d800667abcdb1c37fe5f773f504e36089aa25252373b28d30f3d6e77d2' 
  AND token = '9bNJ7pVEt4M8LVtNsTZuk4x5hecIMissvcWXEwkUwl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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