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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fceaa9b0ed22d0ecb6507a8f6c7ad3bbc3d03d4d3aafd39df0a92c9bb9472a' 
  AND token = 'pnEXr7XOgpVdgkQPYTfAmff9hsxyy9z0+tSaSUeb03M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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