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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84cd72733fa79d3d8600f2e48cc5d4a7d384abbc69c334d1f682f5e05e66e7a' 
  AND token = 'uNYeU5YxmhRA2VrX3sFFse03Ezyg/lqxEQ1ElyYw/Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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