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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6044e1912524c83c96f5aba70f6630546c87173aa33bc2aa2b38944ddfb0ee' 
  AND token = 'qmsGleBP5SNaenGLcbPcyQwXlyemjIP0dZlMr9vhoZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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